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Hi Stephen. With that Dob you will have to run a Paracorr, so a 3.5mm eyepiece is going to give you 770x. That is not a very practical magnification to use. I would say you are better off spending money on a longer focal length. Maybe start off with the 7mm and see how that performs with your sky conditions.
For a given focal length the Delos will be sharper than the Nagler, yet an Abbe Ortho will be better again than the Delos as a dedicated planetary eyepiece. For the ultimate in planetary observing, nothing beats a bino viewer, in my opinion. Best alround eyepiece I have ever used for both DSO and planetary and lunar is the Delos.
Nice new scope, who is making your mirror?
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